From the experimental study, a tool rotational speed of rpm and dwell time of 20 s produced good shear strength of N and the corresponding grain size was 4.
However, such softening can be recovered by a postweld aging treatment. Codigo Do Trabalho: De Meester, and A. Still J.: Kasuga, and H. Brandi S. Increasing or decreasing the defocusing distance out of this range resulted in a remarkable decrease in the penetration depth.
In addition, significant elastic energy, which is stored due to the deformation of high-strength materials, can be released once the crack starts propagating, resulting in unstable crack growth. View at Google Scholar F. This indicates that there is no significant oxygen contamination taking place during laser welding when shielded as in these experiments.
Each color represents a different type and amount of strain. The observations from these studies are now discussed in turn. Laser welding parameters. Manuscript submitted July 7, Verwimp, B. Welding in the World. The mechanical properties of the welds were evaluated globally through standard ASTM tensile specimens as well as through a series of specialized mechanical testing sample geometries which examined the properties of individual microstructural zones.
In the present investigation, it is believed that porosity formation was mainly attributed to insufficient surface cleaning of base metal prior to welding and, to a lesser extent, insufficient shielding.
This could be attributed to the unique effect of simultaneously decreasing the size of ferrite grains and martensite particles.
Table 3 shows the weld crack occurrence in these alloys at different welding speeds. Hence, with an increasing amount of martensite phase, there will be more brittle features on the fracture surface and a lower fracture strain is seen in as shown by the area reduction in Figure 7 d.
Effect of welding speed on cracking of welded joints made without backing strip. Katou, K. All rights reserved. Nakade K.: Venie, and R. The main effects plots and the interaction effect plots have been plotted in order to understand the actual effect of input on the output.
Nowacki J.: Application of flux-cored wires for improved productivity in offshore duplex pipework. The radiograph from a successful weld is shown in Fig- ure 2. Effect of laser beam energy and incident angle on the pulse laser welding of stainless steel thin sheet, Journal of materials processing technology, Vol Zhang, Y.
Their chemical compositions and mechanical properties are given in Table 1. Kovac L.
Metwally, A. Ruggiero et. This experiment has no risks could be noted because all apparatus were safety J. Stress Stress is simply the result of straining the metal. Experimental design approach to the process parameter optimization for laser welding of martensitic stainless steel in a constrained overlap configuration.
The n value of a material can be defined fundamentally as the metal's stretchability; however, it also is an expression of a material's stretch distribution characteristics.
The effect of each parameter has been studied. However, acceptable weld profile was obtained with shifting the focal point below the specimen' top surface. The other approach was concerned with solving the solidification cracking problem in autogeneous welding using a backing strip from the same base metal.
Solidification cracking problem has been solved through two different approaches. Drimal D.:. crack healing, microstructure, and mechanical properties of the laser repair-welded CMLC precipitation-hardened superalloy. To ensure the strength of the repair-welded area, this study used the direct re-melting approach, and simulated the repair welding with the ﬁller addition, which has.
Effects of Welding Positions on Mechanical Properties and Microstructure in Weld Metal of High Strength Steel High Power Density Laser Build-Up Welding with CNC Precision "Effect of Dwell Time on Friction Stir Spot Welded Dual Phase Steel", Advanced Materials Research, Vols.pp.
May 01, · Free Online Library: Changes in the mechanical properties of laser-welded polymer specimens of polypropylene and polycarbonate through different sterilization procedures.(Report) by "Polymer Engineering and Science"; Engineering and manufacturing Science and technology, general Calorimetry Chemical properties Mechanical properties Ethylene Usage Ethylene oxide Gamma.
mechanical properties of the weld (Akhter et al., ) (Fig. 1). Figure 1. (a) The schematic view of the laser welding of galvanized steel in a zero gap lap-joint configuration and (b) the acquired weld bead with pores 2. Review of the laser welding of galvanized steels in a lap joint configuration.
vibrational sample magnetometry was used for characterizing magnetic properties. Texture evolution during laser welding of AISI stainless steel was also studied and a correlation was made between texture evolution and magnetic properties of the welded samples.
The effects of welding cycle on the mechanical properties of the laser. Dec 19, · Welding Process Selection for Joining Materials depends upon mechanical properties, type of welded joints, their quality required in the service condition, cost and availability of the machine and operators skill.Mechanical properties of laser welded dualphase